Quantum strangeness breaks the light barrier


(Image: stock.xchng) IN THE weird world of quantum mechanics, the phenomenon of entanglement trumps all for strangeness – and maybe also for speed. Two entangled particles are so deeply linked that measuring one influences the other, regardless of the distance between them. In some interpretations, a signal passes between the two particles faster than light. To test this idea, Daniel Salart and colleagues at the University of Geneva in Switzerland sent pairs of entangled photons to labs 18 kilometres apart. By measuring the properties of each photon in many of these pairs,
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